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Effect of exosomes on repair of cartilage defect. a Representative macroscopic images of the regenerated tissues. b ICRS macroscopic scores. Data represent mean ± SEM. *p < 0.05, **p < 0.01, n = 5. c Staining results of HE, TB, Saf-O, and immunohistochemical staining for type II collagens. d Wakitani scores for the histological sections. Data represent mean ± SEM. *p < 0.05, **p < 0.01, n = 5
